2 Doorbell Pro's connected to a L16 Nutone Mechinical Chime

I have purchased 2 Doorbell Pros. One for Front Door one for Back and installed them on a Nutone L16 Mechanical chime. My transformer voltage is 17.1 volts and rated at 30VA. After about a week of installation at 3 am the door bell began to start to ring about every 10 mins. No notifications on the app just the doorbell would patialy ring. ( Just the "ding" of the "ding dong" as they say) After about 2 hours of this I got up and disconnected the doorbells. It lasted about a week and started again. First of all the Nutone L16 is not listed on either of you compatibility lists so I do not know if its compatible or not. Secondly is there a fix for this issue it always seems to start when we are in bed.